How to Tell Your Current Job You're Leaving for a Better One

First, good for you for going into a better job! Second, thank them for everything and inform them about your decision in a very short but yet polite way. Don’t give reasons or excuse. It’s only a job

Hello! Just tell them the truth and be direct. Be yourself! If you found something that you feel is a better fit for you and your lifestyle, just tell them. If they are not understanding, that's on them not you. Good luck with the new job!